We all know that the airline biz is in the doldrums, and United is trying to drum up traffic for the remainder of the year with this enticing offer.

Each time you fly on United for the rest of 2009, you earn a discount on a flight in 2010.

Fly once and get 5% off; twice 10% off, 3 times 20% off, 4 times 30% off, 5 times 40% off, six or more times, 50% off. The discount is valid on any published United fare, even on business and first class, but is not combinable with other non-combinable offers. Registration is required.